What is the best way to align an object's rotation with a Vive controller's rotation when the trigger is pulled in A-Frame?

Exploring the possibilities of creating A-Frame applications, I decided to dive into the world of A-Frame Dominoes. In my current project, objects are spawned in response to the Vive trigger being pressed.

While I have successfully managed to align the position of the newly created object with that of the Vive controller at trigger activation, I am facing challenges when it comes to matching the rotation of the new object with that of the controller.

I have attempted the following approach:

onTriggerDown: function () {
  var sceneEl = d3.select(this.el.sceneEl);
  var controllerWorldPosition = this.el.object3D.getWorldPosition();
  var controllerWorldRotation = this.el.object3D.getWorldRotation();

  sceneEl.append('a-obj-model')
         .attr('id', 'base-street-children')
         .attr('scale', '0.01 0.01 0.01')
         .attr('position', controllerWorldPosition)
         .attr('rotation', controllerWorldRotation)
         .attr('src', '#base-street-obj')
         .attr('mtl', '#base-street-mtl');
},

I am wondering if there is a specific method or technique in JavaScript for setting the rotation of a new object that I might be overlooking?

javascriptthree.jsrotationaframe

Answer №1

In the world of Three.js, rotation is measured in radians, but in A-Frame, rotation is measured in degrees. When extracting rotation data from a Three.js Object3D, it's important to remember this distinction and convert the values accordingly before applying them to an A-Frame entity.

Here is one way this conversion can be implemented in your specific case:

.attr('rotation', function() {
  var controllerWorldRotationX = controllerWorldRotation._x / (Math.PI / 180);
  var controllerWorldRotationY = controllerWorldRotation._y / (Math.PI / 180);
  var controllerWorldRotationZ = controllerWorldRotation._z / (Math.PI / 180);

  return controllerWorldRotationX + ' ' + controllerWorldRotationY + ' ' + controllerWorldRotationZ;
})

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